Which one is better Robots.txt or Meta robots Tag

We started rolling out the next generation of the Penguin webspam algorithm this afternoon (May 22, 2013), and the rollout is now complete. About 2.3% of English-US queries are affected to the degree that a regular user might notice. The change has also finished rolling out for other languages world-wide. The scope of Penguin varies by language, e.g. languages with more webspam will see more impact.
 
shilpa sharma said:
We started rolling out the next generation of the Penguin webspam algorithm this afternoon (May 22, 2013), and the rollout is now complete. About 2.3% of English-US queries are affected to the degree that a regular user might notice. The change has also finished rolling out for other languages world-wide. The scope of Penguin varies by language, e.g. languages with more webspam will see more impact.
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Where did you find this information that Google Penguin rolling out today????? Are you really serious about this?? if so than can you provide the resource link that confirm about this update.
 
Robots.txt file can be used for whole website while Meta robots Tag will have to use separately for each page, so using Robots.txt is much better.
 
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